Machine to countersink twenty holes in a wheel hub shell for short spokes



March 26, 1935. H. TORMYN ET'AL 1,995,485.

MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUB SHELL FOR SHORTSPOKES Filed July 29, 1932 4 Sheets-Sheet 1 WMWIW I March 26, 1935. Y HTORMYN gr AL 1,995,485

MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUE SHELL FOR SHORTSPOKES Filed July 29, 1932 4 Sheets-Sheet 2 4 Sheets-Sheet 3 I00 I f H.TORMYN ET AL Filed July 29, 1952 $977270. 5' zrzzyzz Ci @2'0771? @T az'eziofl WA M MACHINE TO COUNTERSINK TWENTI HOLES IN A WHEEL HUB SHELLFOR SHORT SPOKES March 26, 1935.

March 26, 1 935. H 'TORMYN ET AL 1,995,485

UNTERSINK TWENTY HOLES IN A WHEEL HUB SHELL FOR SHORT SPOKES Filed July29, 1932 4 Sheets-Sheet 4 Patented Mar. 26, 1935 HOLES IN A,VVHEEL .H

snon'r SPOKES SHELL FOR Herman Tormyn and Frank F. Wiethoff, Detroit,

Mich assignors to General Motors Corporation, Detroit, Mich., acorporation of Delaware Application July 29, 1932, Serial No. 625,991. 1

' '7 Claims." (01. 78

. This invention relates-to= manufactureof wire wheels 'andhasparticular reference toa machine for the countersinking oi. the-spokeholes-in the, :wheel hub. The machine of the present invention .isoneofztenmachines and.

follows in sequence the operation of the "machineldescribed in ourcopending application, Serial No. 625,990, filed July 29, 1932.

After the wheel hub has been circumferem.

. tially punched with the plurality of holes for theshort spokes assetout in the copendinglap; plication referred to, :the wheel hubfistrans:

ferred to the machine of the present invention in which the holes arecountersunk Jon the in-i ner portion of the hub. The machine comprisesthe lower die shoe and the top die or is fitted that punch holder slidein which the punch-holders aremounted. The punch holder slides have aface cooperating with the cams on the guide block to force the punchholders outwardly when the top shoe descends, the outward movement ofthe punch holders causing the punches to countersink the spoke. holes.

On the drawings: I Figure 1 isa front view of the press of theinvention. 2

- Figure 2 is. aside view of the structure of Figurel.

Figure 3 is an enlarged sectional detailed view through the center ofthe press showing only the mechanism for countersinking the openings.

ing the parts 'in separated relation before the top shoe has descendedupon the die shoe.

Figure 5 is a plan view taken substantially on the line 55 of Figures 3and-4 with parts broken away clearer to illustrate the construc-' tion.

Figure 6 is a perspective View block.

Figure '7 is a perspective View of one of the punch holders.

Referringto the drawings, the numeral 2 indicates the machine or pressof the invention as 'a whole The press comprises the upright frame atthe upper portion of which an electric motor 4 'is mounted. The motorhas the driving pulley 6 which drives 'a belt 8 which in turn drives aflywheel lilrigidly mounted on the axle 12which extends acrossthe frameof themachine and at the opposite side has a gear wheel (not shown)mounted thereon which meshes of the guide Figure 4 is a view similar toFigure 3 but show-' Withand drives the large gear 14 rigidly mounted onthe shaft 16 having a crank 18 intermediate its ends. The crank 18 hasattached thereto the connecting rod-20 which operates the crosshead 22suitably attached to the top shoe 24 of the die. The lower die shoeindicated at 26 and a part thereof is resiliently mounted on the ends ofthe pressure pins 36 resting on alower plate 30.; Suitable pins 32connect the plate 30 with a second plate 34 secured on a; pis-" ton 35connected to a piston operating a cylinder 37 to form an air cushion.The pins 36 abut at'their lower ends against the plate 30 and at theupper ends. against the bottom of the slideholder 38 (Figures 3 and'4).This structure gives a resilient mounting to the slide hold- 81 38., t 4A handle 40 operating a linkage system 42 operates a suitable clutch(not shown) which causes the small gear on the end of-the shaft 12 tobeengaged with the shaft and to rotate the gear 14. After one operation ofthe punch a suitable throw-out mechanism will throw the clutch out-0fengagement with the gear. This mechanism is not shown but isconventional .and well known in the art. A suitable brake' drum is shownat 44 having brake shoes 46 operated from a suitable link-age 48.

The parts so far described are conventional and are well known in theart of presses.

Referring to Figures 3 and 4 the die of. the invention comprises the topdie shoe 24 and the lower die shoe 26. The topshoe is reciprocable withthe crosshead-22 and has openings 50 in which there are mounted thebushings 52 slidably'toguide the'guide pins 54 rigidlymounted at 56 inthe-die shoe. V The die shoe has rigidlymounted at its center the slideguide block 58 held to thedie shoe by means of the machine bolts 60. Theguide block 58 is best shown in theperspective view in Figure 6 and isshown to be conical at its upper end.

Theconicalportion has ten T-shaped grooves 62 chine bolts which passthrough openings in the cap 68 and are threaded into the lower portion66. By referring toFigures 3 and 4, it will be noted that the bolts '70are outwardly and downwardly inclined so that in their final position,they will hold the cap portion 68 spaced from the lower ring portion 66.

In the space between the ring portion 66 and the cap 68 ten radiallyarranged punch holders '72 are slidably mounted. One of these holders isshown in detail in Figure 7 and each comprises the inner T-shaped head'74 which slidably fits in one of the slots 62 of the guide block 58.Each punch holder has the upper and lower openings '76 and 78 and thevertical slot 80. In theends of P the openings '76 and 78 atthe outerface 82 of the slide the punches 84 are mounted. The openings 76 and 78extend allthe way through the block in order that the punchmay beknocked. out for purposes of replacement. Suitable openings 86 arepositioned at right angles to the openings 76 and 78, the purpose ofwhich is'to receive screws 90 which rigidly hold the punchesiid in theslide blocks 72. A projecting portion or tongue 92: on the lower portionof the slide blocks fits into the corresponding groove 94 on theupperface of the lower ring member 66 and guides the blocks in adefini tepath. 7 The bolts it? pass through the slots 80- the slide blocks andhave the bushings 96 therearound inside the slots to take up wear and toprevent rattle and looseness of the parts).

The cap portion 68 andthe outer portion of the punch holders 72am shapedto receive the wheel hub 98'as shown Figures 3 and 4.

The topdie or shoe 50 inchides'theblock mo and the pressure pad orpositioning ring 1 02-; The ring 102 has a shape 104 at its interiortion to conform to the shape of the wheel hub ad jacent the punchholders "72 and pqmchholder slide 38 as is shown in Figures 3 and 4.When the top shoe descends the shaped part 104 fits on to the wheel hubat the punch holder slidesand the block passes through the opening I06in the wheel-hub and strikes the top race of the cap 68. p v

Theoperati'on of the die is as fol-lows: When the top shoe descends andthe block comes in contact with the cap 68 and the ring 102 with thewheel hub 98, it will push the holder slidesa downwardly from theposition shown in Figure 4- to that shownin Figure 3. This will causethe in ward'ly projecting ring 108% at the bottom of the ring member 66of the slide holder to leave the projection 64 on the slide guide'block58 or cause arelati-ve movement of the slide holder relative to theguide block 58. This movement'wil l cause the T-heads "T4 of the punchholders tosl ide or move in the 'l-Fslots 62 of the-conical portion ofthe guide block 58 to force-the punch holders 72 outwardly and cause thepunches 84 to enter thespoke openings the wheel huh and counter: sinkthe openings. The downwardmovement of the slide holder will force thepressure pins 36 downward which in turn will press the plate 30'downward against the tension of the air. cushion and when the, top shoe24 moves upward the air cushion will force the plate 30 upward and causethe pins 36' to return the s1ideho1'der'tothe position shown inFi'gure4'.

. When the parts have been returned to the position shownin Figure 4'.the clutch mechanism previously mentioned will throwv the power from theshatt 1 6 80 that the operator may remove the hub- 98 and place anewone. in. the die.

By again operating the handle 40-the new wheel hub: will have: its:spoke openings countersunk in the manner previously described.

We claim:

1. In a machine for countersinking spoke holes in a wheel hub, as asub-combination, a holder slide comprising a lower ring portion and anupper cap portion, said lower portion having a plurality of grooves, aplurality of slotted. punch holders slidable between said. ring and capportions, said holders having tongues fitting in said grooves, boltssecured to and uniting said ring and cap portions, said bolts passingthrough the slots in said punch holders.

2'. In a machineto countersink spoke holes in a wheel hub, adie shoe, aguide block rigidly mounted on the shoe, said block having a pluralityof inclined T-shaped slots, a slide holder slidably mounted over theblock' and adapted to receive a wheel hub having aplurality of spokeopenings, a plurality of punch holders slidably mounted on said slideholder, each punch holder having a T-shaped'head operating in one ofsaid IT-shaped slots; countersinking punches insaid punch, hoide rs, momto'cause the holder slide. to slide-over the block to cause the inclined'Fslots: to mice the punch holders to move toward the'wheel hub tocountersink the. spoke openings;

3.11:. a machine to comrtersink: spoke holes in. a wheel hub, a dieshoe, 5) guide: block rigidly mounted on said. die shoe, a slide holdermovably mounted. on said guide block and adapted toreceive a wheel hubhaving a plurality 0d spokeopenings. a plurality of punch holdersmovabliv momted in. said slide holder, punches in said. punch holders,said punch holders actuated by the guide block: by themovement of theslide hoilsder relative to the block, and means. to cause the slideholder to movev relative to the block to cause. the punch holders: tomove toward the wheel huh to countersink the openings.v

4 In a machine to countersink spoke holes in a;- wheel; hub, a die shoe,2. guide block rigidly mounted on said die shoe, a slide. holder movablyted over and astound. said guide block and. secured thereto and. adaptedto receive a wheel:

having: a. plmzality ofispoke openings; a pluof punch. holders movablymmmtedi in said: slide holder, punches in said punch holders, saidipunch holders actuated by the guide block by the movement of the slideholder relative to! the block, and means to cause the slide holder tomovei relative to the block. to cause the punch holders to move towardthe wheel hub to countersink. the

openings;

.5. m a for countersink-mg spoke holes in .awiue: wheel huh. a lower dieshoe, a guide block secured thereto, said guide block having a pluralityof cam surfaces at the upper endthere of, a punch holder slidefittingover and movabl'y secured. to said block for reciprocable movement, saidslide shaped to receive a. wheel. hub, a. plu-- rality of punch holderssecured to and. fitting in said slide for sliding movement relativethereto, the ends of said holders engaging said; camsurfaces, punches insaid punch holders, a reciprocable top shoe, apad. secured theretohaving a surface conforming in shape to the shape of the holder slideand wheel. hub, a block onthe top shoe. adapted toengage the. holderslide, the. downward movement of said top shoe causing the block and thepad. to engage the holder slide and wheel hub, respectively, to push theholder slide downwardly and cause the camv surfaces tomove the slidestoward thewheel hub to cause the punches to countersink the openings inthe hub? r I t i 1 .6. In: av machine for. countersinking spoke holes ina wire wheel hub, a lower die shoe having an upwardly projecting blockportion, said block portion having a plurality of cam grooves at theupper end thereof, a punch holder slide slidably secured to said blockportion, said slide adapted to receive a wheel hub, a plurality of punchholders mounted in and guided in said slide for sliding movement andhaving a part operating in said grooves, punches secured in saidholders, a reciprocable top shoe over said die shoe having a pad tobackthe hub and cooperating with said slide holder to hold the wheel hub inposition when the top shoe is reciprocated, the downward movement ofsaid top shoe moving said holder slide and wheel hub downwardly andcausing the cam grooves to move the punch holders in the slide holderand toward the wheel hub to cause the punches to countersink the spokeholes in the hub.

7. In a machine for countersinking spoke holes in a wire wheel hub,a'lower die shoe, a top shoe over the die shoe, means to mount said top,shoe for reciprocating movement relative to the die shoe, a cam portionon said die shoe having a plurality of cam surfaces, a punch'holderslide secured to and slidable over said portion and adapted to receiveand correctly position a wheel hub, a plurality of punch holdersslidably mount-' ed in said holder slide and having one end thereofengaging the cam surfaces, punches in the other ends of said punchholders, means to reciprocate said top shoe to cause said holder slideto slide over said portion to cause the punch holder ends to move oversaid cam surfaces to move the punch holders to cause the punches tocountersink the spoke holes in the wheel hub.

HERMAN TORMYN. FRANK F. WIETHOFF.

